Cotter-pin extractor



H. E. ROBERTSQN GOTTER PIN EXTRACTOR FilediOot. 8, 1924'lIl'III'I'Il/IlWIIIIIIII E2 INVENTOR. flay/2 i. fiche/"T500 ATTORNEYDec. 14-, T1926.

l,tl0,969

PATENT HUGH E. ROBERTSON, QF OAKLAND, CALIFORNIA, ASSIGNOE 03L ONE-HALFTO STAN- FORD B. NICKELS, 01 OAKLAND, OALIFQRIQIA.

COTTER'-PIN nxrnncc'ron.

Application filed October .a, 1924 This invention relates to cotter pinextractors, and by which a cotter key or pin may be removed from itsseat or securement easily and quickly.

Heretotore, the extraction of a cotter pin from more or lessinaccessible and remote places, has been very diflicult, annoying andinconvenient and causing much time to be consumed. Ordinary pliers aregenerally used for easily accessible pins, but very often the pliersslip off the pin and in the aggregate, time is lost.

An important object of the invention, is the provision of a handy andconvenient tool.

that can be hooked into the eye of a cotter pin, and by means of asuitable leverage extract the pin from service by a simple grip of thehand about a pair of handles on the tool.

Another object is to construct a tool for this purpose having but a fewparts and strongly made throughout.

Another object is to provide hook means for engaging the eye of a cotterpin that positively will prevent the tool from slipping from the pinwhen once engaged.

Another object is to provide means for changing the leverage of thepulling members to suit the user of the device.

A further object is to. produce the device somewhat in the shape ofapistol, using the trigger and handle for operating the pin-- withdrawingmember.

I attain the above objects by the novel const-ructionof my device, andother objects and advantages of theinvention will appear in thesubjolned description ot the accompanying sheet of drawings, in which:

Figure 1 is a side elevation of a cotter pin extractor constructed inaccordance with my invention. The withdrawing member is shown in hookedengagement with the eye of a seated pin just previous to applyingtension and operating the device by the hand shown in dot-and-dashlines.

Fig. 2 is a view similar to the above but showing the barrel engagingthe nut and the hook pulled therein with the withdrawn pin after thedevice has been operated. Part of the barrel has been shown in sectionfor clearness.

Fig. 3 is a sectional view on the line 33 of Fig. 2.

Adverting to the drawing and figures thereof: The device consists of thebarrel Serial no. 742,319.

or body represented by the numeral 1, which ispr'eterably tubular inform with slots 2 cut through the opposite walls thereof, to receive thelever 3 pivotally connected as at l, and the lever 5 similarly pivotedat 6. These levers project from the opposite sides of the barrel asshown, and are -removably joined together above the barrel by links 7and 7 by means of the screws 8 and 9. A series of holes 10 and 11 areprovided in the respective levers, for changing their tulcrums andtherewith also their relation with respect to each other for shorter orlonger leverage conditions to suit the pulling power otthe user, oftheclevice.

The withdrawing member 12 consists preferably of a rodor flat strip ofspring steel mounted to slide within the barrel 1, and has a hook .13formed at one end thereof adapted to project from the end of the barrel,and at the opposite end is formed an eye 15 for pivotally engaging theextreme lower end of the lever 3 by the pin 17. The said. lower end isformed U-shaped as at 16 for strength and alignment purposes. A pin 14in theb arrel serves to hold the withdrawing member 12 in positiontherein and allow it to slide with ease.

A handle 18 preferably hollow or U- :shaped in cross-section is madeintegral with the barrel 1 as by rivits19, and a depression 20 may beformed on the handle to fit the hand for convenient gripping, andlikewise the lever'5 be provided'with a series of wideand shallowserrations 21 toengage the fingers. A spring 522 is provided for thehandle and is riveted to the same at 9.3, and has side portions erectedup to form a groove for guiding the lower end of the hand-lever 5. Thepurpose oi the spring is $57 to aid in thro wing the hook-rod 12 outwardto expose the hook 13 for engagement.

In the operation of the extractor, the hook 13 thereof is inserted andhooked into the eye of the cotter pin that is to be withdrawn, and withthe barrel and levers in the position as shown in Fig. 1 and the handthus simultaneously engaging the handle and the lever 5, the lever 5 ispulled back to the handle 18, and through the cross-links 7 and 7' movethe lever 3 which pulls back the hook rod 12 and with it the cotter pin.the pull of the lever 5 exerting a reaction through the barrel on thestationary nut adjacent the cotter pin until the resistance of lli) thepin is finally overcome and thus its withdrawal is QiliGCiIQCl.

From the foregoing description taken in connection with the accompanyingdrawings, the advantages of the construction and method of operationwill be readily under stood by those skilled in the art to which theinvention appertains, and while I have described the principle ofoperation, together with the device which I now consider to be too bestembodiment thereof, I desire to have it understood that the device shownis merely illustrative and that such changes may be made, when desired,as fall within the scope of the appended claims.

Having thus described my invention, what I claim as newand desire tosecure by Letters Patent of the United States is the following 1. Acotter pin extractor comprising a tubular body terminating in a rigidhandle extending substantially at a right angle to said body; a memberslidably mounted in said body and having a hooked end adapted to projectfrom said body; and leverage means extending through and pivotally supported in said body and pivotally connected to the opposite end of saidmember for withdrawing the member into the body by the simultaneousmanipulation of said leverage means and said handle, the leverage meansbeing adjnstably fulcrumed in said body.

2. A cotter pin extractor comprising a tubular body terminating in arigid handle extending substantially at a right angle to said body; amember slidably mounted in said body and having a hook adapted toproject from said body; a lever pivotally connected at one end with saidmember and pivotally connect-ed between its ends with said body; andmeans pivotally connected with the other end of said lever and pivot-'ally connected with said body for withdrawing the member into the bodybythe simultaneous manipulation of said means and said handle.

3. An extractor of the class described, com-- prising a body, a rodhaving a hook formed on one end adapted to engage the eye of a cotterpin and an eye formed on the other end of said rod, a lever pivotallyconnected at an end thereof to the eye in said rod and pivotallyconnected between its ends to said body, a second lever spaced from saidfirst lever and similarly connected between its ends to said body, acrosslink pivotally connecting the said two levers together at their topends, and a handle projecting from said body adjacent the free end ofsaid second lever.

4. An extractor of the class described. com prising a tubular body, aflexible rod mounted therein having a hook on one end adapted to engagethe eye of a cotter pin and an eye on the other end of said rod, a pairoi levers spaced from each other and pivotally connected to said body ina slot therethrough. an arm of one of the said levers being pivotallyconnected in the eye ot' said rodand the other arm of said lever adaptedto pivotally engage a link which is also adapted to be engaged by an armor" the other lever and the other arm of the latter lever remainingfree, and a handle rigidly projecting from said; body adjacent the saidtree arm whereby said arm may be pulled by the fingers of the handgrasping said handle to withdraw the said cotter pin :t'rom service.

5 A cotter pin extractor, comprising a tubular body, a flat strip ofspring material adapted to slide longitudinally therein, a hook on oneend of said strip and an eye on the other end thereof, a lever pivotedin said body and extending on opposite sic therethrough, the extremityof one arm or said lever being pivoted to the eye in said strip, across-link pivotally connected at one end with the other arm of saidlever, an operating lever also pivoted in said body and having one armpivotally connected with the other end of said cross-link and adapted tohave its other arm extend freely, and a handle rigidly projecting "fromsaid body adjacent said tree arm, the said levers provided with aplurality of holes whereby the leverage relation therebetween may bechanged at will.

in testimony whereof I aitix my signature.

HUGH ROBERTSON.

